Cyclonic Separators by Bernoulli
The basic principle of a centrifugal separator is to remove settle-able solids, such as sand, from liquids
The cyclonic separators are not actually a filter since there is no screen element inside to filter out the particles. The separation is instead ensured by means of centrifugal force, and the separator’s efficiency is directly proportional to the specific density and size distribution of the particles. The centrifugal separator eliminates 98% of all particles with a specific gravity of 2.6-2.8 (such as sand) down to a size of 75 microns, provided that the pressure loss over the unit is minimum 0.3 bar.
Ciclonic separators should be installed downstream of the feed pump in order to ensure enough pressure during purging, and to overcome the pressure drop over the unit.
A liquid containing particles is fed tangentially into the cylindrical top of the centrifugal separator to create rotation. By passing through slots in the intake chamber, the flow velocity is further accelerated.
The centrifugal force moves heavy particles to the sides of the barrel. They are then pushed downwards and accumulated in the collection chamber in the bottom of the separator.
A deflector plate, located in the top of the collection chamber, changes the direction of flow.
Solid-free liquid move upwards around the vortex and exit via the separator’s top outlet.
The separated solids are either periodically or continuously purged from the collection chamber.
Cyclonic separators advantages
Separation efficiency does not depend on vertical or horizontal position
Separation occurs without any interruption to the flow
Very little liquid is lost by purging
No need for any consumable material
The CPW product line consists of the smallest centrifugal separators, in five sizes ranging from DN15 to DN40 and covering capacities up to 16 m³/h.
The CPW product line is particular interesting in applications with aggressive liquids, since the material of construction is HD polyethylene.
The CPW operating pressure range is 1-8 bar(g) at 40°C.
The CXW product line consists of ten cyclonic separator models in sizes DN 10-100, covering capacities from as low as 0.7 m³/h up to 90 m³/h.
This range comes in three different materials: carbon steel (CKW), stainless steel AISI 304 (CRW) and stainless steel AISI 316 (CSW).
The CXW operating pressure range is 1-12 bar(g) at ambient temperature and is available in dismountable models.
The CXWV product line covers the upper capacity range, from 65 m³/h to 2700 m³/h, with ten models in sizes DN 100-500.
It comes in three different materials: carbon steel (CKWV), stainless steel AISI 304 (CRWV) and stainless steel AISI 316 (CSWV).
The mounting position is vertical, and to support it, legs are included. For smaller sizes up to DN250, the operating pressure range is 1-10 bar(g) at 80°C. The larger sizes achieve 1-10 bar(g) at 40°C in standard operation.
A variant of the CXWV product line permits the intake chamber to be dismounted.
The CXWL product line is the near twin of the CXWV product line. The only difference is that they have leaning support legs to support installations with height limitations.
Available sizes are DN 100-500, with capacities of up to 2700 m³/h. The CXWL product line comes in three different materials: carbon steel (CKWV), stainless steel AISI 304 (CRWV) and stainless steel AISI 316 (CSWV). For the smaller sizes of up to DN250, the operating pressure range is 1-10 bar(g) at 80°C, whereas the larger sizes achieve 1-10 bar(g) at 40°C in standard operation.
Like the CXWV product line, the CXWL is available in dismountable models.
A centrifugal separator can be used in a wide range of applications, from protection of nozzles and heat exchangers to pre-filtration in water treatment installations
Industries such as metal production, food processing, pulp and paper, chemicals, and oil and gas all employ centrifugal separators
To drain off the suspended solids accumulated in the collection chamber of the ciclonic separator, either a manual discharge drain or an automatic discharge system can be used. Both are available from Bernoulli System. For the automatic discharge system, purging intervals and duration can both be easily adjusted. The automatic discharge system comes in two versions: electrical and pneumatic. Both purge systems include a ball valve, an actuator and a time controller. The manual discharge drain consists of a ball valve with a hand lever.
The given indications of separation efficiencies are a combined result of theoretical calculations and in field experience. Expected separation efficiency may also depend on the shape of actual particles, pressure loss and other factors.
Centrifugal separators are only efficient if they are at their "sweet spot" for work. This means that they are in the upper part of their capacity, where the pressure drop is around 1 bar. Otherwise they are no longer efficient and become just one more section of pipe